‘Logic’ (pub. 25.08.15-17:26). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from http://www.commens.org/dictionary/entry/quote-one-two-three.
Quote:
Logic treats of signs. A sign is a third.
Source:
Peirce, C. S. (1886). One, Two, Three. MS [W] 573; MS [R] 905.
URL:
http://www.commens.org/dictionary/entry/quote-one-two-three